Northern Voyagers

Coldblood {2}{g} (You may cast this spell for
its coldblood cost if no spells were cast since the beginning of last turn.)
At the beginning of your upkeep, you may tap Northern Voyagers. If you do, it explores and
it won't untap during your next untap step. (Reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a
+1/+1 counter on this creature, then put the card
back or put it into your graveyard.)